Exciting fluid for electrical batteries.



UNITED STATES Patented June '7, 1904.

' PATENT OFFICE.

GEORGE F. ATVVOOD, OF WAKEFIELD, MASSACHUSETTS, ASSIGNOR TO PRIMARY.POWER COMPANY, OF WAKEFIELD, MASSACHUSETTS.

EXCITING FLUID FOR ELECTRICAL BATTERIES.

SPECIFICATION forming part of Letters Patent No. 761,641, dated June 7,1904.

Applica i n fil October 3, 1903. Serial No. 175,607. (No specimens.)

To all whom it may concern:

Be it known that I, GEORGE F. ATWooD, a citizen of the United States,residing at Wakefield, in the county of Middlesex and State ofMassachusetts, have invented new and useful Improvements in Compositionfor Exciting Fluids for Electric Batteries, of which the following is aspecification.

My invention relates to a composition for use in the cell of electricalbatteries in which the negative electrode is immersed. It is especiallyadapted for use in batteries of the Bunsen type, and its great valueresides in its economy and efficiency. The electrode immersed in thecomposition is preferably zinc.

In preparing the solution in which the Zinc electrode is to be immersedI take thirty gallons of'water and add to it sulfuric acid until itsspecific gravity is 1.2. After cooling I mix therewith one and one-halfpounds of ammonium carbonate, ten ounces of carbonate ofsodium, and tenounces of bisulfate of mercury. This solution is then diluted with sixparts of water and is ready for use. The addition of the carbonates ofammonium and sodium to the sulfuric acid forms, respectively, sulfate ofammonium and sulfate of sodium. It is obvious, therefore, thatcorresponding proportions of these salts might be added to the sulfuricacid direct.

Iam not the first to use, broadly, the ingredients above described; butI am the first to use the specific proportions mentioned, and these Ifindgive superior results.

Having described my invention, What I claim is A composition for use inthe cell of electrical batteries in which the negative or zinc.

element is immersed, consisting of ammonium carbonate one and one-halfpounds, carbonate of sodium ten ounces, bisulfateof mercury ten ounces,and sufficient sulfuric acidto make the specific gravity of thirtygallons of water 1.2, as specified.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

GEORGE F. ATVVOOD.

Witnesses:

THoMAs E. TURPIN, N. O. HEALY.

